The electronic constant speed mixer is driven by a brushless DC motor and is suitable for mixing low to medium and high viscosity liquids in the laboratory. The machine has a reasonable and compact structure, ultra-low noise, and is maintenance-free. The stirring speed is controlled by a microprocessor, which can timely and effectively compensate for speed changes caused by load changes and power supply voltage fluctuations, and the constant speed is reliable. The built-in automatic overload protection device ensures the safety of long-term high-load continuous operation of the experiment; the operating status knob control makes the experimental operation easier, and the stirring speed is steplessly adjusted to meet the need to correct the stirring speed at any time during the experiment; the digital display setting and actual output stirring speed ensure intuitive collection of experimental data; the operation timing control ensures that the timeliness of the experiment is effectively controllable. The stable stirring speed is competent for stirring high-viscosity media and slurries.